Keep out the cold-built-in louvers to help | #buil..

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Keep out the cold-built-in louvers to help | #built-in louver insulating glass #advantages of hollow built-in louvers #chenming HIGH-TECH’ s factory

Keep out the cold-built-in louvers to help

Keep out the cold-built-in louvers to help

The heat transfer coefficient of doors and windows, that is, the K value. It is the main index used to measure the thermal insulation performance of doors and windows